The dog, , will be made a good watchdog.
A. to train properly
B. being trained properly
C. properly to train
D. trained properly
网友回答
A. to train properly
B. being trained properly
C. properly to train
(答案→)D. trained properly
解析：过去分词短语作条件状语，相当于if it is trained properly。watchdog看门狗。